Data conversion considerations for software radios

Abstract

Software radios are an attractive alternative to conventional designs. However, they place rather extreme demands upon the analog to digital and digital to analog converters in the signal processing chain. This paper explores the detailed requirements of data converters in software radios.

Subband Architecture for Hybrid Filter Bank A/D Converters

“…3 shows a narrow band gap at the negative frequencies for the first aliaising term in the case of α = 7%. It represents the oversampling band with a shift of m 2π MT for each aliasing term T m (e jω ) according to (2) and (3) [16].…”

“…Using a wide-band A/D or D/A converter, the conventional analog sharp filters and channelizer are substituted by digital filtering [2] and then the cost of receiver is independent of the channel number. Nowadays, the performance of ADCs can not still fulfill the requirements of the wide-band receiver of SDR approach.…”